Sabermetrician Bill James introduced the concept of a defensive spectrum in his seminal "Baseball Abstract" books. The spectrum ranks the most difficult to least difficult positions to fill based on how tough each one is defensively. The easiest position (other than designated hitter, which requires no defensive value) is first base. Teams can put their biggest sluggers at the position knowing that defense is a secondary concern.
So why are so many first basemen hitting like pitchers so far this season? Dave Cameron addressed the issue of light-hitting left fielders last week, but at least clubs can claim they're putting speed in lieu of offense in left. No one can make that claim at first base. So for those teams currently afflicted with a light hitter at first, here are some fixes.
Let's start with teams that are least likely to contend because they have it easiest.
San Diego's platoon of Brad Hawpe and Jorge Cantu has combined to hit below the Mendoza Line with a sub-.250 on-base percentage. That's typical of the team with the worst offense in the NL, and the Padres won't contend this season.